Update Rules Syntax

Question

Hi,
I am checking update rules. what we are doing getting some fields from one ODS and storing in variables and these variables are used to update some other ODS.
for this purpose we are using select single * from xxx(ODS Name). but we want one 1 or two fields from the ODS. if i write select single yyy(field name) from xxx(ODS name) is there any performance improvement.
Can any one please suggest me how can i improve performance of Update rules and transfer rules.
Thanks
Rajini

Answer 1

Hi Rajini,
For multiple fileds to be picked up from ur ODS you can use the following select statement.
Lets say you want 3 fields A, B and C from ODS YOXYZ. You can use,
Select single A B C into (va_A, va_B, va_C) from  /bic/aYOXYZ00 where (use your selections).
This is quite fast and will never have a performance issue.
If there are more than one record you want to select, it is always useful to store them in an internal table and use the select statement in the Start routine.
In this way your Select statement is only executed once per data package.
The most important point which should always be kept in mind is the selections you do in the where clause.
If all the Keys of the ODS are used, you dont have to worry about the performance.
If there are fields other than Keys, then it is advisable to create indexing on the ODS for those fields. This greately improves the performance.
Hope this helps!!
Assign points if you find the explanation useful.
Regards,
Jadeep